Dressing mechanism for abrasive wheels



June 8, 1965 E. ADAMCZYK DRESSING MECHANISM FOR ABRASIVE WHEELS FiledNov. 17, 1961 xxxxx xx INVENTOR. EDWARD S. ADAMCZYK ATTORNEY.

3,187,736 DRESSING MECHANISM FOR ABRASWE WHEELS Edward S. Adamczyk, 47Mazarin St., Indian Qrchard, Springfield, Mass. Filed Nov. 17, 1961,Ser. No. 153,119 1 Claim. ((11. 125-11) The present invention relatesgenerally to new and useful improvements and structural refinements in adressing mechanism and is directed more particularly to the pro- 'visionof a magnetized wheel dressing device and to an improvement in the meansfor moving in extremely fine increments a diamond point toward and awayfrom the wheel of any one of a variety of types of grinding machinessuch as surface grinders, cutter grinders, and the like to be dressed.

It will be helpful to an understanding of my invention first to brieflyconsider some of the essential points and more important features andaspects thereof, so that same may be kept in mind during subsequentreading of the detailed description of the practical embodiment of myimprovement and illustration thereof in the hereunto annexed drawing.

Without intending to place undue limitations upon the scope of theinvention beyond what may be required by the state of the prior art, theparticular embodiment may be briefly described as embracing the conceptof a mag netized support means having a threaded tool carrier associatedtherewith and reciprocable relative thereto, with the support meanshaving a pole reversing means whereby the tool carrier may be releasedfrom its engagement therewith.

It is here contemplated to provide an unthreaded, magnetized support,and a threaded tool carrier, the said tool carrier being held upon thesaid support by the magnetic force of the support, and beingreciprocable relative thereto for the reason that the fine apex of eachof the threads forms a thin helical rib which bears directly upon thesupport is subject to the magnetic pull thereof.

A typical type of grinding wheel dressing device in use at presentcomprises a simple bar member having United States Patent 3,187,735Patented June 8, 1965 r not susceptible of long-life.

a diamond member fixedly positioned thereon so as to 1 project at rightangles from one surface of the bar. However, under circumstances whereit may be necessary to dress a grinding Wheel in the midst of a grindingoperation, moving the wheel from its operative position into contactwith the dressing tool presents the difliculty of restoring the grindingwheel to that same operative position. Assuming that only a very limitedamount of additional grinding was necessary to complete the grindingoperation, the operator would have to blue the surface and carefullyrestore the grinding wheel into the desired operative position toprevent the possibility of grinding the surface too much.

The common practice is to move the grinding wheel to the dressing tool,rather than vice versa. Some attempts have been made to devise grindingwheel dressing fixtures 'or tools wherein the dressing tool head whichholds the dressing diamond, for example, is moved into engagement withthe dressing wheel rather than vice Versa. However, these devices havebeen quite elaborate, complicated, and hence relatively expensive,thereby deterring wwide sale thereof.

The existing practices in the trade, as exemplified by the known priorart, contemplate the use of complicated jig and bracket structures formoving a dressing tool toward or away from the grinding wheel and suchstructures It may be given as a principal object of the presentinvention to provide a grinding wheel dressing device in which theholder for the dressing tool, such as a diamond tool member, isadjustably movable relative to a base member and is capable of beingfixedly held in operative position when it has been moved into thedesired relationship to the wheel it is to dress, while the base memberis held attached for example to a magnetic chuck of a surface grinder,or the like. During operational use, minute adjustments of the tool maybe made merely by a unique and novel rotation thereof relative to thebase member.

The invention comprehends a particular construction, arrangement,combination and relationship of the various elements, components andinstrumentalities of my dressing apparatus, useful with equal facilityin the dressing of not only grinding wheels but also abrasive wheels andjig grinders of various constructions, all as exemplified in thefollowing detailed disclosure wherein the objects hereof, as hereindefined, will be apparent.

A further object hereof is to provide wheel dressing apparatus whichwill not necessitate the threading of the support means on which thethreaded tool carrier will move, thereby materially reducing the cost ofproduction thereof.

Another chief object is to construct apparatus of the general characterindicated having means for permitting minute adjustment of the dressingtool relative to the wheel to be dressed.

Still another feature worthy of particular notice is that I providemeans within the magnetized support means for reversing the polaritythereof whereby the dressing tool may be readily gripped thereto 'orreleased from engagement therewith.

The instrumentalities of the structure hereof which comprise the entiredressing device are relatively few in number, simple in construction,easily assembled, sturdy and desirable so as to provide long life, andmay be manufactured at a cost to permit the sale thereof for substantially less than adjustable dressing devices presently available on themarket.

In the drawing:

FIG, 1 is a front elevational viewof an exemplary grinding wheelselected for purposes of illustrating a typical use of -a grinding wheeldressing device embodying the principles of the present invention. Inthis View, the side of the wheel is being dressed;

FIG. 2 is a side elevational view of the wheel dressing device as viewedfrom the line 2-2 in FIG. 1; and

FIG. 3 is a top plan view of the wheel dressing device shown in FIG. 1.

With continued reference now to the drawing, which illustrates a typicaland preferred embodiment of the invention for the purpose of disclosureand forms a part of this specification, I have shown a dressingmechanism used in the dressing of abrasive wheels, jig grinders and thelike and comprising a magnetized support means, generally indicated by10, fixed to a base B by any suitable means so as to be locatable insubstantial adjacency to the grinding Wheel W, and having a threadeddiamond carrier, generally indicated by 20, associated therewith.

It will be understood that for purposes of simplifying the illustrationand description of the present invention,

an exemplary grinding wheel W, rotatably supported by is an arbor (notshown), has been selected for purposes of describing the details andfunction ofa dressing device embodying the present invention, it beingunderstood that the invention may named with other types of grinderssuch as cutter grinders and the like.

Further, base B may comprise a magnetic chuck upon the upper or workingsurface of which the grinding wheel dressing device of the presentinvention may be positioned.

Said support means comprises a three part base member, 'a first part forexample, being formed from a suitable casting of steel and iron so as tohave forward and rearward vertically-extending walls 30 and 32respectively with the rearward wall 32 being of greater height than theforward wall 30, and a pair of spaced and parallel side walls 34 and 36,each connecting between the adjacent side edges of said walls 30 and 32.A horizontally-extending upper wall 40 of the support means 10extendsrforwardly from said rearward wall 32 between said side walls 34and 36 and is connected at its forwardmost edge with an inclined wall 42which connects at its lowermost edge to the top edge of saidforward'wall 30.

A second part of said support means 10 comprehends a metallic plate 44preferentially, though not obligatorily, made of brass or equivalentmaterial and disposed between the forward wall 30 of said first part anda third part is in the form of a block of steel or iron 46 which issecured to the said first part by any suitable means.

7 The uppermost planar surface 48-of said block 46- is disposed in aplane below and parallel to the plane of said upper wall 40 of saidfirst part and is alignable horizontally with or is coplanar with theuppermost planar surface 49 of the plate 44 and the lowermost edge ofthe inclined wall 42, as best shown in FIG. 2, so as to form with saidinclined wall 42 a V surface for the support of a round shaft as willappear.

Said support means i permanently magnetized so as to be provided withthe usual polarity and is provided with a generallyhorizontally-extending, reciprocable, pole-reversing shaft 50, knownas apush-button, extending through suitable and aligned openings extendingtherethrough between the forward and rearward walls thereof, and throughthe members 44 and 46, all substantially centrally thereof.

By the means of the push button, the magneticholding 7 power of thesupport means is controlled. As the button is pressed from the rear, itis ON and as it is pressed from the front it is OFF, the non-magneticplate 44 serving to divide the two fields or separate, the poles oneither side thereof wherefore the polarity may be reversed, all as isknown.

The diamond carrier or dressing tool 20 willbe understood to comprise acylindrical shank 70, which shank will be helically threaded andprovided at one end with a knob-like enlargement 72 for manualengagement to facilitate the turning thereof.

Said shank 70 will be provided with a longitudinallyextending centralopening therealong in which a dressing tool 74 will be slidablyreceivable and .releasably fixed as by a set-screw 76 or the like. Thefree outer end of the dressing tool 74 will carry the diamond 78 inknown manner.

The diamond carrier 20 is positionable in the V surface recess definedby the inclined wall 42 and the upper coplanar surfaces of the members44 and 46 so as to be extendable transversely of the support means, asshown in FIG. 1.

The magnetic field of the support means will exert sufficient force uponthe diamond carrier so as to retain the latter in a nested positionrelative to the said V surface. V

The diamond carrier 20 is rotatable about its axis by the manualengagement of the knob 72 causing the dressing tool 74 and the diamondpoint 78 to be moved laterally toward or away from the abrasive wheel W.

The range of movement of the diamond carrier will be determined by thepitch of the threads whereby the tool carrier may be moved laterally inextremely minute increment wherefore a substantial range of differentpositions of the dressing tool relative to the grinding wheel areprovided.-

The magnetic field set up by the support 10 will be of sufficientstrength to retain the tool carrier thereon but will not be of suchstrength as to preclude the rotation and movement of the carrierrelative thereto.

The inclined wall 42 and the coplanar upper walls 48 and 49 form bearingsurfaces upon which the threads of the shank 70 of the tool carrier mayride. 2

In essence, the adjacent threads of the shank 70 form small pocketswhich do not-have contact with these bearing surfaces, the small apex ofeach thread being the only point of contact with the magnetized block.

Stated otherwise, the spiral thread on the shank 70 of the tool carrierforms a thin, continuous helical rib which is in contact with andsubject to the magnetic force of the base, while the shank per se is notin contact with and is not subject, to as great a degree, to the saidmagnetic force.

This helical rib will preferentially be of extremely fine pitch, wherebyupon rotation, the tool carrier may be moved toward or away from thewheel in minute increments.

When it is desired to move the carrier 20 laterally to the right, as inFIG. 1, the knob 72 is rotated in a clockwise direction, and when it isdesired to move the carrier to the left, the knob 72 is rotated in acounterclockwise direction.

If it is desired to remove the carrier 20 from th support 10, the shaft50 is pressed inwardly whereby the polarity of the support is reversed,thus neutralizing the magnetic field thereof, whereby the carrier may beremoved therefrom.

' It will be understood that. the walls of the recess in the supportmeans 10-are unthreaded and plane through- .mond carriers of variousdiameters, although this feature will in no way'affect the interactionbetween the diamond carrier and the support.

The V-notch may also be provided with a lip (not shown) adjacent theforward wall of the block 46 in order to eliminate any tendency of thediamond carrier to rock relative to the support.

It will also be understood that the support means 10 may be placed atvarious angles relative to the grinding wheel, as maybe desired.

I therefore particularly point out and distinctly claim as my invention:

In a means for dressing grinding wheels, a magnetized dressing toolcarrier support and a dressing tool carrier disposed thereon, saiddressing tool carrier comprising a shank carrying a continuous radiallyoutwardly extending helical rib, said shank having a turning knob at oneend thereof and carrying a diamond point at the opposite end thereof,said support being provided with a transversely-extending recess thewalls of which are plane throughout for the nesting of said tool carrierrelative thereto, with said continuous helical rib being the onlycontact of said carrier with the walls of the recess and being subjectto the magnetic force of said support with said tool carrier beingmovable laterally 5 6 relative to said support upon manual rotation ofthe 2,442,172 5/48 Klockars 125-11 turning knob of said tool carrier.2,655,910 10/53 Grow 125-11 I. SPENCER OVERHOLSER, Primary Examiner.

5 FRANK H. BRONAUGH, JOHN C. CHRISTIE,

Examiners.

References Cited by the Examiner UNITED STATES PATENTS 1,966,127 7/34 LeTarte. 2,337,249 12/43 Koller 125-11

